Been trying out the latest Overhaul update. Pretty good, especially when dealing with the guns' general feel. It has a few nice touches, like death animations for the bosses. The Eye of Cthulhu flips out and explodes into gore, the Brian of Cthulhu teleports madly only to stop for a few seconds before exploding into gore, etc. Melee weapons and bows now have charge ups, which modify some swords proyectiles, like the Beam Sword now being able to shoot three afterimages when charged. Guns now have magazines and need to be reloaded, which is nice. Not too annoying, since you have a roll now which compensates for the lack of invincibility after being hit. I haven't tried crossbows, but they received a pretty beefy damage upgrade to offset them being a 1 shot ranged weapon. The fire mechanics are good, but you need to be careful otherwise your treehouse can resemble the Vietnam war in no time with just a misplaced torch or from a stray shot from your imp summon.
It's kinda demanding though, the spent casings stay for the whole session, same for the remains of the enemies. It chugs a lot, especially during snowstorms in winter. I couldn't even kill the destroyer because my fps absolutely tanked the moment I summoned it. It also modified some of the speeds you can go, so it kind of freaks out when you're using gravitation potions since you fall pretty fast.